Coated article, process of coating an article, and method of using a coated article

A coated article, comprising:

• a substrate;
• a porous coating material positioned proximal to the substrate in comparison to a thermal barrier coating material;
• and
• the thermal barrier coating material positioned distal from the substrate in comparison to the porous coating material;
• wherein the porous coating material includes a porosity between about 1 percent and about 20 percent, by volume;
• wherein the thermal barrier coating material has a thermal conductivity that is lower than a thermal conductivity of the substrate;
• wherein the porous coating material differs in composition from the thermal barrier coating material.

A coated article, comprising:

• a substrate;
• a porous coating material positioned proximal to the substrate in comparison to a thermal barrier coating material;
• and
• the thermal barrier coating material positioned distal from the substrate in comparison to the porous coating material;
• wherein the porous coating material resists at least one of sintering, densification, and phase destabilization for a period of about 16,000 hours at a temperature of about 2200° F.